PHOENIX -- It's the classic baseball play, a ball hit down the line that is fair and a double or triple. Or it's foul and it's just another strike.

The classic play is being reworked. Thanks to baseball's new replay rules, the fair/foul calls are subject to challenge and video review. That means changes to the way players have always done things.

The hitter almost by definition has to assume that the ball is going to land fair, and he's going to have to run out balls that in previous years he could comfortably hold up on. The defender must make the same assumption and not only get to the ball and come up throwing.

The A's had the first of their five replay games this spring Thursday night against the Rockies, a game the A's won 10-5. The five games are all the preview Oakland will get to a new way of playing baseball, so it was no surprise the A's made two challenges, both on plays at first base. The A's won the first, lost the second.

And things will never quite be the same.

"It's going to mean big changes," As right fielder Josh Reddick said. "If a play down the line is at all close, you've got to get to it and come up throwing. You don't know if the umpires will rule it different than you saw it."

Center fielder Coco Crisp, who has made a living as a line-to-line hitter with more than his share of balls hit that were within inches of one side of the line or the other, says he's not sure how great the impact of the rule change will be.

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"I plan on playing exactly the way I've always played," Crisp said. "And that's to run everything out. The umpires will make the calls the umpires make. As long as you run everything out, that much won't change."

Crisp was called out on a double-play grounder in the second inning, but manager Bob Melvin challenged what was an obviously bad call, the double play became just one out and the A's scored a run on the play.

Melvin tried to strike twice when Daniel Robertson was called out on a bang-bang play at first in the seventh. The call was upheld after the replay, as Melvin believed might be the case.

"We need to find out which ones they're going to overturn," Melvin said.

Crisp aside, most hitters have spent their lives knowing what was fair and what wasn't fair, based on their view of the play and their view of the umpire. And they've stopped running once they saw a call being made.

But now umpires' calls are subject to revision, so it behooves players running the bases to get as far as they can as fast as they can. And it behooves defenders to try to cut that progress short.

"There's been controversy over this," Crisp said. "I think you play under the new rules and it will work itself out."

Reddick, on the other hand, sees a fundamental change in the way players -- and the umpires -- must approach each borderline play.

"It's always been frustrating to see calls go the wrong way and guys not taking accountability for their calls,'' he said. "I think this rule brings some accountability back into the game.

"There should be fewer `what-if' games, games when you spend time thinking afterward if the score would have been different if just one call had gone the other way."

In season, video will be sent to a clearing house in New York. On Thursday, however, the replay judgment was done by MLB staff in the press box in Phoenix.

Starter A.J. Griffin was knocked around for nine hits, including his first two homers yielded of the spring by the Rockies. His spring ERA has climbed to 10.38. He's allowed 19 hits in 8﻿2/3 innings in three starts.

"I felt I competed well," said Griffin, admitting the homers were bombs but several off the hits off him were bloops or broken bats. He threw "a lotta good changeups" but added the fastball needs work, especially with its location. Melvin said Griffin was up in the strike zone "and he wasn't happy about it."

Reliever Ryan Cook threw 20 pitches off a mound on the back field before the game in another test of his right shoulder, the second in three days. He said he feels great and that his next tie out he'll face hitters.

"In my mind, there's no doubt that I could be ready for opening day," he said. "It's not for me to say. I really got after it today with my slider."

The A's remain concerned there isn't enough time for Cook to be ready for the opener.

Daric Barton (hamstring) did a full workout Thursday, and assuming he reports to the clubhouse Friday morning pain free, he could be in one of the lineups for Saturday's split squad.

Luke Gregerson threw one shutout inning and drew praise from Melvin, as did Jesse Chavez, who threw four scoreless innings to get the save.